Global oil prices rebounded on Tuesday as a cold snap in the United States boosted demand for heating fuel, analysts said. New York’s main contract West Texas Intermediate for February delivery rose 37 cents to $93.80 a barrel. Brent North crude...

Potential oil reserves are often treated as a state secret. This is especially true in Saudi Arabia, the world’s largest oil producer. But soon, the cheap energy bonanza could be on the downturn, according to US State Department documents...